Evening sky, or how do I use the Sky Texture Node?
I don't know anything about Sky Texture but it looks like this setup works the way you want:

Plug the Sky Texture (Preetham mode) into a Gradient into your ColorRamp (always better to use a Gradient before a ColorRamp if you want your gradient to look like your ColorRamp spectrum, I dont know why though).

You can also use Texture Coordinate > Mapping nodes before your Sky Texture if you want more control on the sky position/orientation.